We stretch our entire body in Kung Fu. Swords, or not. With a complete stretching program, you shouldn't need sword specific stretches. Those muscles should be flexible for striking anyway.

Oh yeah, and I fence also. After a real Chinese stretching program (three actually, lol), I can honestly say, "No athletic activity has ever posed a challenge to my flexibility." Though I haven't tried contortionism yet, lol.

Personally, I don't think traditional stretching is as beneficial before training as after it. Standard passive-static stretching exercises weaken the target muscles up to 20% for about two hours. this leaves you prone to injuries while training. For this reason, I recommend a short warm-up and dynamic stretching exercises to start with. Save the passive stretches for after the wind-down (end of class).